Mt. Airy
Named in 6 PJM planning documents for 2 projects, from October 8, 2024 to October 6, 2026.
Existingdescribed as
APSzone
230 kVkV as printed
6mentions
Also printed as: Mt. Airy Substation
Projects naming this substation
Figures are from the most recent document naming each project, as printed. Each links to its page.
| Project | Status as printed | Cost estimate | In-service date | Customer load | As of |
|---|---|---|---|---|---|
| Carroll 230/138 kV Transformer #4 and Misoperation Relays APS-2023-034 and APS-2023-063 · s3189.1, s3190.1 |
Not printed | $8.6M | 12/31/2026 | Not printed | 2024-10-08 TEAC |
| Carroll - Mount Airy 230 kV line APS-2023-058 · s3871.1 |
Not printed | $50M | 06/30/2029 | Not printed | 2026-10-06 TEAC |
Changes between documents
Where two documents print different values for the same project. A large change in a cost estimate can reflect a need being combined with others into one solution, not only a re-estimate; read both pages.
| What changed | Printed values | Earlier | Later |
|---|---|---|---|
| Substations named | CARROLL; MT AIRY → CARROLL; MOUNT AIRY; MT AIRY | 2025-11-04 | 2026-04-07 |
| Substations named | CARROLL; MOUNT AIRY; MT AIRY → CARROLL; MT AIRY | 2026-04-07 | 2026-10-06 |
Every mention
| Date | Document | Project | What the document says about it |
|---|---|---|---|
| 2026-10-06 | TEAC Informational Only - APS Local Plan Submission of the Supplemental Projects for 2026 p. 41 |
Carroll - Mount Airy 230 kV line | “Adjust relaying at Carroll and Mt. Airy substations” 230 kV |
| 2026-09-28* | SRRTEP Western APS local plan submission of the supplemental projects for 2026 RTEP p. 41 |
Carroll - Mount Airy 230 kV line | “Adjust relaying at Carroll and Mt. Airy substations” |
| 2026-09-08* | SRRTEP Western APS local plan submission of the supplemental projects for 2024 RTEP p. 66 |
Carroll 230/138 kV Transformer #4 and Misoperation Relays | “At Mt. Airy Substation : Replace line tuner and coax, wave trap, circuit breaker, disconnect switch, and relaying” 230 kV |
| 2026-04-07 | TEAC Item 03 - APS Supplemental Projects p. 3 |
Carroll - Mount Airy 230 kV line | “Adjust relaying at Carroll and Mt. Airy substations” |
| 2025-11-04 | TEAC Item 04 - APS Supplemental Projects - Version 7 p. 10 |
Carroll - Mount Airy 230 kV line | “Adjust relaying at Carroll and Mt. Airy substations” 230 kV |
| 2024-10-08 | TEAC Informational Only - APS Local Plan submission of supplemental project 2024 p. 66 |
Carroll 230/138 kV Transformer #4 and Misoperation Relays | “At Mt. Airy Substation :” 230 kV |
* A local-plan posting carries no meeting date; the date shown is when pjm.com last modified the file.
Before relying on any of this
- Names are machine-extracted from PDFs by a language model. Every exported name was checked to be printed in the PDF text; names read only from maps or diagrams are excluded.
- An entry is a name within a transmission zone, not a verified physical facility. The same name in two zones is two entries; spelling variants are merged only when they differ by punctuation, case or a generic suffix such as "Substation".
- role is "new" only where a cited document phrase describes the substation as new or describes constructing it, "existing" where a phrase describes work at it, otherwise "unknown".
- Costs, dates, statuses and loads are the documents' own printed values for the most recent document that names the substation. Each one shipped here is printed on its cited page ("verification": "exact" or "on-page"); values that failed that check are withheld and counted in figures_withheld_unverified. None has been reviewed by a person.
- Zone is the transmission owner whose deck presented the project. PJM-SYSTEM marks names from PJM's own reliability decks, which span zones.
- A printed customer load is the amount a document states for a request. It says nothing about the substation's capability.